This is a laser printer cartridge toner chip. It has a memory which stores information about the cartridge print usage. If you refill your toner cartridge, your printer will still say empty because of this chip. Using a cheap microcontroller connected to ordinary pins and gently spreading the legs so that contact can be made with the correct pin and only the correct pin, one can read the contents of the memory. Subsequently, one can compare the contents of an empty cartridge memory with a full cartridge memory. One can also print a page, then read the contents of the memory again, and note any differences. What is thought to be printer usage information can then be identified and cleared. Doing this, one can refill their own laser printer toner cartridge and use it. However, the memory chip is also thought to include a microprocessor or logic such that certain memory areas such as serial number may only be written once, or only be written using a secret, unobvious, command or write sequence. Therefore, it is thought printers are made to remember cartridge serial numbers, and when a serial number for a cartridge is remembered as previously exhausted, even if the cartridge is currently reporting to be full, it will either be immediately set to empty or after only a few prints, or will be rejected as an invalid cartridge.To use your printer, only use printer manufacturer authorized toner cartridges.
i only want ink tank now, but the printhead which is 1/3 of the printer cost, still need replacement after 50k
>>107802370Get an old Canon. Printhead on the cartridge, can get new printhead for $5
>>107802384Yeah but canon units are all with exposed paper storage tray, not suitable for my workshop.
Printer manufacturers are hilariously evil. Were it not for piracy, game devs would have gone the same route long ago. You can't afford to be naive about anything in this world anymore.
>>107802213Buy a printer with refillable tanks not cartridges.
my money is that a print cartridge's microchip contains a cryptographic lockto alter the memory on the cartridge, you probably have to know how to ask it for a challenge, it then proceeds to give you a prng bit stream, then you have to sha hash the stream with a key and send it back within a certain amount of time to unlock the chip.that's how some faulty chickshit "smart" batteries were set up that i had bought and had failed, which resulted in an fatal error bit being set. of course, the key was well known, so i tried to hack the battery to rebuild it before i gave up because i was wasting too much time fucking around with it. printer manufacturers are probably more creative about their keys.
>>107802370This one is laser, not inkjet. The same chip with different identifying information is used for the imaging unit for this printer. Unlike the toner cartridges, the printer does not lock if the imaging unit reaches its estimated life count. If your printhead had a count chip on it, maybe you would want to reset it instead of replacing.>>107802647I don't think ink ppm is fast enough for this printer's application>>107802667This chip is labeled TI####, so, some have looked for other ti chips that may be similar to find any kind of documentation, but as far as I know, they did not.
Why not just make your own printer with a CNC machine and automatic tool changer holding a bunch of different colors of permanent marker?
>>107802773>they did notit was the exact same for the battery i was hacking, it was a custom TI BQxxx chipi found that TI doesn't sell the particular smart battery chip i was looking at to consumers, nor do they provide datasheetsbut you can still learn a lot about the chip through the datasheets of the one's you can buy. that's how people more or less hacked the custom chip.
you can check an example of the type of security i just described by browsing one of these BQ chip datasheets. see section 15https://www.ti.com/lit/ug/sluubt5c/sluubt5c.pdf?ts=1767862227352i bet it's the exact same thing on the print cartridges
>>107802635i wouldnt fucker
Big Print is unironically a real conspiracy. Nothing goodv has happened to people trying to develop/sell alternatives. They want to hold you hostage with expensive, often proprietary refills to keep you in a pseudo-subscription style payment loop. You'll pay the exorbitant cost when you desperately need that work/uni document printed, and it'll barely last. Don't like it? Fuck you monkey, we'll sue!
>>107802788Maybe f the ones that are already done are really not reasonable>>107802817It's interesting, it says permanent fail state for things like overvoltage overcurrent conditions, if you accidentally plugged your thing in wrong for a second somehow, I guess you could replace the 1 chip?
>>107803162>permanent fail state for things likethere's lots of ways li-ion batteries can fail. mine failed because it was fully depleted (the circuit design was flawed and had too small of a resistance between the terminals even when not in use).you probably can't just swap chips out unless you had another custom chip, since the other half of the security is built into the device powered by the battery.i was trying to gain full access and reset the fail bit, as a manufacturer would do if they refurbished the battery.i actually tried powering the device using a power supply, and the device said fuck you, you aren't using an authorized battery.this was DJI chinkshit, btw, which is all but worthless in the US now because of import control and laws against using them for gov't projects.
>>107803270On laptop batteries packs they have a fuse that can be blown with an external current for permanent disablement, maybe this one is similar?An overdischarged battery actually is dangerous to charge again so maybe consider that too.>>107802213They have cryptographic security on those, I imagine not too dissimilar to the kind on smartcards, IDs, passports and such. This is only as secure as the software on the printer itself of course, so they locked that down too, full chain of trust from boot, anti downgrade, auto updates, who knows what else.
